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  • C99 variable length automatic array performance

    - by aaa
    Is there significant cpu/memory overhead associated with using automatic arrays with g++/Intel on 64-bit x86 linux platform? int function(int N) { double array[N]; overhead compared to allocating array before hand (assuming function is called multiple times) overhead compared to using new overhead compared to using malloc The range of N may be from 1kb to 16kb roughly, stack overrun is not a problem.

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  • About Backward Compatibility of .NET Framework 4

    - by wuminqi
    We have an WPF Application build on .net framework 3.5. Some testers find if they uninstall .net framework 3.5, but install .net framework 4.0, our APP fails to launch itself. Dose this mean that .net framework 4.0 does not include all 3.5 libs, and users have to install .net 3.5 even though they have 4.0? I see here are some migration issues listed by Microsoft http://msdn.microsoft.com/en-us/library/ee941656.aspx#windows_presentation_foundation_wpf Are they all breaking changes so that the backward compatibility is ruined? Thanks

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  • Java GC: top object classes promoted (by size)?

    - by Java Geek
    Hello! Please let me know what is the best way to determine composition of young generation memory promoted to old generation, after each young GC event? Ideally I would like to know class names which are responsible say, for 80% of heap in each "young gen - old gen" promotion chunk; Example: I have 600M young gen, each tenure promotes 6M; I want to know which objects compose this 6M. Thank you.

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  • Passing a pointer to a function in objective-c

    - by Chiodo
    Hi, i've a stupid questiona about passing pointer. I've this: @interface MyClass : NSObject myobj* foo; -(void)doSomething:(myobj*)aObj; @end @implementation MyClass -(void)doSomething:(myobj*)aObj { cFuncCall(&aObj); //alloc memory and init the object } -(id)init { //init stuff... [self doSomething:foo]; // foo retun 0x0!!! } @end why foo return nil??? It should be initialized by cFuncCall!

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  • How do I create and read non-global variables that aren't destroyed at end of function?

    - by Paul Reilly
    I am attempting to code some plugins to use with MIDI sequencers but have hit a stumbling block. I can't use global-scope variables to store information because multiple instances of the .dll can exist which share memory. How do I create a class (for re-usability purposes in other plugins) containing 2 dimensional array and other variables the content of which is to be shared between functions? If that is possible, how would I read and write the data from the function in the framework where I do the processing?

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  • jQuery UI Droppable: Detect which draggables are dropped on an element?

    - by Rosarch
    I have the jQuery UI framework's draggable and droppable elements working. I would like to programmatically determine which draggable elements are currently dropped on which droppable elements. Is there an easy way to do this? I thought of using event listeners to detect drop and out events, then keep a dictionary or something in memory to keep track, but this seems contrived. Better ideas?

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  • VSS Deprecated Files

    - by timothyawiseman
    We are using VSS for version control (changing to another version control system is not an option right now), and are occassionally running into issues where a file has been completely deprecated with its functionality split into other new files. For historical archival reasons we need to keep those files in the version control sytem. Is there some way to clearly mark them as deprecated and no longer used?

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  • Read text file in java

    - by user326091
    Hi, I have a text file. I would like to retrieve the content from one line to another line. For example, the file may be 200K lines. I want to read the content from line 78 to line 2735. Since the file may be very large, I do not want to read the whole content into the memory. thanks Frank

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  • Extern variable at specific address

    - by AndiNo
    Using C++ and GCC, can I declare an extern variable that uses a specific address in memory? Something like int key attribute((__at(0x9000))); AFAIK this specific option only works on embedded systems. If there is such an option for use on the x86 platform, how can I use it?

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  • read lenght of string from stdin

    - by teoz
    I want to take a string from stdin but I don't want a static array of fixed size i knew that scanf need something where save the stdin input, but i can't do something like this: char string[10] scanf("%s",string); becouse i need to knew before how long will be the string in order to allocate the right memory space can you help me to resolve this problem?

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  • javax.activation.DataSource size question

    - by folone
    How do I get the amount of physical memory, consumed by the DataSource (specifically — ByteArrayDataSource)? I use ByteArrayDataSource (byte[] bytes, String type) constructor, where I get bytes like this: String str = "test"; byte[] bytes = str.getBytes(); Would that be str.length() in bytes? Any other ideas?

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  • Detect pointer arithmetics because of LARGEADDRESSAWARE

    - by Suma
    I would like to switch my application to LARGEADDRESSAWARE. One of issues to watch for is pointer arithmetic, as pointer difference can no longer be represented as signed 32b. Is there some way how to find automatically all instances of pointer subtraction in a large C++ project? If not, is there some "least effort" manual or semi-automatic method how to achieve this?

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  • What needs to be passed to an editor from a keyboard app to move the cursor one char left?

    - by yno
    What key code does an Android editor app expect the keyboard app to send when it is going to be interpreted as a left arrow? In other words, what is the keyboard program supposed to send to its calling program (some kind of editor) if the user intends to move the cursor one char to the left? A related issue: what do the minus values for the "android:codes" attribute mean? () Any pointers to these issues will be appreciated.

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  • How do I convert a System::IO::Stream^ to an LPCSTR for PlaySound?

    - by Jon Cage
    I'm trying to embed and then play back a .wav file in a C++/CLI app but all the examples I've seen which use PlaySound are in VB. I can't see how to get froma Stream^ to the LPCSTR which PlaySound requires: System::IO::Stream^ s = Assembly::GetExecutingAssembly()->GetManifestResourceStream ("Ping.wav"); LPCSTR buf = s->????; PlaySound(buf, NULL, SND_ASYNC|SND_MEMORY|SND_NOWAIT); I guess I need some sort of horrible .net memory conversion magic.

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  • conversion from C++ to C

    - by Dave
    Hi I am interested by converting some code from C++ to C (mostly because i need to use the library with/from other C program and other language) . C is a better gateway for that I am interested to replicate few C++ concept like inheritance for inst . Does anyone know good references or has already work on some similar issues. For inst how to deal with inheritance , adding new members variable/ methods to child class , ... Thx for your help

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  • Does System.Web.mail (CDonts) issue smtp quit commands?

    - by JL
    .net System.Net.Mail does not issue SMTP quit commands in version 3.5 or lower. Although the problem is fixed in .net v4.0 RTM, unfortunately v4.0 cannot handle attachments in an email larger than 3-4MB's so I can't use it in my solution. I was thinking of maybe rolling back to the now outdated CDonts found in System.Web.Mail. Can anyone confirm if CDonts mailing routines explicitly issues SMTP Quit commands?

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  • Why is jQuery's .removeClass() adding a space to the class attribute?

    - by Sosh
    I'm having some strange issues with .removeClass() and .addClass() in jQuery. Specifically it seems that when I use .removeClass() the class is indeed removed, but a single space is left in it's place. then when I .addClass("secondclass") I get class=" secondclass" (with the space in front). I'm using jQuery 1.4.1 Is this intended behaviour or a bug? How to stop it?

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  • Php/MySQL to ASP.NET/MSSQL, Suggest if its worth the trouble.

    - by user302656
    Hello Guys, We have been using PHP/MySQL for our web application which has been growing a lot, the database is around 4-5GB and one of the table is 2GB sometimes, hence slowing down whenever any queries to that table is called. Should we just try to optimize, or are we using MySQL above its limit? Will switching our web app to .NET/MSSQL resolve the issues? Thanks

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